如何评价《人教版数学课本》发明的相对论证明勾股定理？

[img]https://img.nga.178.com/attachments/mon_202006/17/-7Q5-485kZmT3cSzk-qo.jpeg.medium.jpg[/img][img]https://img.nga.178.com/attachments/mon_202006/17/-7Q5-4xhgZnT3cSzk-qo.jpeg.medium.jpg[/img][img]https://img.nga.178.com/attachments/mon_202006/17/-7Q5-8izrZaT3cSlc-sg.jpeg.medium.jpg[/img]

nga老哥觉得这个证明严密吗？